Food mixer



FIG. 1 is a top plan view of a food mixer showing my new design;

FIG. 2 is a front elevational view thereof, the rear view being substantially a mirror image thereof;

FIG. 3 is a right side elevational view thereof, the left side being substantially a mirror image thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a food mixer, as shown and described. 